#include<stdio.h>
#include<stdlib.h>

int foo(int a, int c)
{
    int k = 0;
    char src[4];

    // 不安全输入
    while(1){
        scanf("%s", &src);
        if(src[0]=='a')break;
    }

    return k + 255;
}

void bad_code()
{
    printf("Congratulations! You entered the bad code.");
}

int main()
{
    int ret = foo(4321, 12);
    printf("successfully exit with %d\n", ret);
    return 0;
}